Improved machine foe heading bolts



0. e. BURDICT,

Bolt Header.

vPatented Sept. 3, 1867.

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@eine @tetra @anni @like IMPROVED MACHINE FOR HEADING BOLTS.

die ,einen entre it it tigen tettrts ntent mit mating ,ne nf tigeA time.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, O. G. BURDICT, of New Haven, in the county of New Haven, and State of Connecticut, have invented a new Improvement in Bolt-Heading Machines; and I do hereby declare the following, when taken in connection with the accompanying drawings, andthe letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

AFigure I, a, side view.

Figure 2, a top view. l

Figure 3, a. central longitudinal sectional-view.

' Figui-es 4 and 5, the operation ofthe heading-dies; and in Figures 6 and 7, the blank-holders. l My invention is designed for upset-ting and forging thelheads of boltsfrom one and the same piece as the bolt, and consists in the combination and mechanism for upsetting and finishing the head.

To enable others skilled in the art to construct 'and use my impromement, I will proceed to describe the same. As illustrated in the accompanying drawingsi A is the bed-plate, supported' upon legs B vor otherwise, and on which the operative mechanism is placed. C is the driving-shaft, supported, and so aste revolve freclyin bearings D, by the application'o't` power thereto in any convenient or weil-known manner. E and E are the two parts of a holding-die, the one, E', firmly fixed tothe bed-plate, the other part, E, fixed te a slide, F, which is operated to moveto or from the part `E by connection with a lever, G, as seen in fig. 2, which said lever G has its fulcrum at Qr/,imd is operated bya cam, H, on the driving-shaft C. I isa slide,'moving in guides J by the action of an eccentric, K, on the shaft C, through a connecting-rod, L, and has fixed in its forward end an'npsetting-die, M, (she fig; 3,) which upsets the metal from which the head is formed. e t and b I; are the four heading-diesxed ea'eh t'o its respective slides a? ct and b', which said slides move freely in guides c bythe `vaction thereon of levers N N N N, having their fulcra atn, and operated by a slide, P, moving in guides It, by the action of cam or cams S on the driving-shaft C; the forward end of the said slide being `inclined, so that when forced between the longer arms of the four levers N, will simultaneously close the four dies a a and b b from the position seen in fig. 4 to that seen in fig. 5, and when withdrawn the said levers will permit'the opening ot' the' said dies by the employment of springs, or otherwise. I prefer to form the head et' the bolt by inserting the blank into aholder, T, seen in fig. G, through which passes a rod, t, of smaller diameter than the blank to be headed. The inner end of the holder is bored out the size and depth oi' the boltto be formed, ,and into the hole bored out, the'blank, when properly heated, is set, and placed between the dies E and E', and, when so set, power being applied to the driving-shaft, the cam H forces the die E upon the holder T,and holds it securely fixed in the required position, the blank being central between the four dies, and directly in front of the upsetting-die, as seen in gf. The continued movement of the driving-shaft forces the npscttingwlie against the end of the blank, upsetting the blank sufficiently to forni the head; then the four dies a a and b b are forced down upon the upset portion of' the blank, and compress it into a regular four-sided form. For the perfect finishing of the head it is better to permit two full revolutions and consequent operations upon the head, between which operations it would be advisable to turn the holder one-quarter over, but yet it is not necessary. When the holder is not used the holding-dies E and E will clasp the-blank in like manner as it does tho holder, and the h'ead in that case be formed directly against the dies E and E in like manner as when the Vholder is used. The upsetting-die M, it will be seen in g. 3, is formed with a slight recess in its face, of the size and form of the head, which tends to form and preserve the angles of the head. When the bolt has been headed in the holder, as seen in iig. 6, the

holder is removed from the machine, when by a blow uponl the end of the rod t the boltwill be forced from the holder,` as seen in tig. 7, then another heated blankinsertcd for similar operation.

`The advantages of the die-holder are, first, there being no joint, as when two-part dies are used, the under side of the-head is formed perfectly smooth. Another advantage is, that by the use of a holder the dies E and E"inay remain unchanged for various-sized bolts, it being only necessary toform the recess in the holder of therequisite size, the exterior of the holder still remaining the same, whereas when the blank is held directly by the dies E different dies must be inserted for dilerent-sizeil bolts; and the general advantage of my machine is its simplicity and inexpenqive construction.

I do not broadly claim the simultaneous operation of four er more dies combined with holding-dies and upsetting-die, :is such are not new.

v Having thus fully described my invention, what I claim as new and useful, :rml desire to secure by Letters The cmbinavtion of the dies a a and b Z1 acting simultaneously, :md movecl in guides radially ce a. common centre by means of the levers N and cams P, in combination with holdingdies E and E', and upsetting-die M, all constructed :incl arranged to operate substantially in the manner as herein set forth. I

ORIN C. BURDICT.

Witnesses: Y J @11N E. EARLE, er A. .IA Timms. 

